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Rapid Microwave–Hydrothermal Synthesis of Anatase Form of Titanium Dioxide

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Pure anatase titanium dioxide was synthesized by a microwave (MW)-assisted hydrolysis of diluted acidic solutions of titanium tetrachloride. MW irradiation combined with hydrothermal process has proved to be a very efficient and fast alternative to conventional hydrothermal technique, as an almost complete crystallization of anatase occurred in reaction times as short as 30 min. The addition of small amounts of sulfuric acid was necessary to obtain a pure anatase phase, as the presence of sulfate prevented the crystallization of trace amounts of brookite. Transmission electron micrographs showed nanoparticles arranged in spherical aggregates with 1% sulfuric acid, while less aggregated nanoparticles were obtained with 0.1% sulfuric acid.
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Document Type: Research Article

Affiliations: 1: Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802 2: Dipartimento di Scienze Farmaceutiche, University of Genoa, 16132 Genoa, Italy

Publication date: November 1, 2005

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